computer-harness

Run the Agent Computer sandbox locally. Gives you a full desktop environment with Claude, Codex, and OpenCode agents accessible through a browser UI.

Quick start

# Set your API keys
export ANTHROPIC_API_KEY="sk-ant-..."
export OPENAI_API_KEY="sk-..."

# Run it
nix run github:getcompanion-ai/computer-harness

Or without Nix:

docker run --rm -it \
  -p 8080:8080 -p 6080:6080 -p 2222:2222 \
  -e ANTHROPIC_API_KEY="$ANTHROPIC_API_KEY" \
  ghcr.io/getcompanion-ai/computer-harness:latest

Ports

Port	Service
8080	Agent UI - browser-based agent interface
6080	VNC - live desktop view via noVNC
2222	SSH - ssh -p 2222 node@localhost

Configuration

Override ports with environment variables:

COMPUTER_UI_PORT=9090 COMPUTER_VNC_PORT=9091 nix run github:getcompanion-ai/computer-harness

Pass extra Docker flags through:

nix run github:getcompanion-ai/computer-harness -- -v /path/to/workspace:/home/node/workspace

Pass extra env vars:

COMPUTER_ENV="-e GITHUB_TOKEN=$GITHUB_TOKEN" nix run github:getcompanion-ai/computer-harness